You can allocate
IP addresses to an Edge Gateway or deallocate the IP addresses. When an IP
address is allocated to an Edge Gateway, you can use that IP address to create
NAT, Firewall, or VPN rules on that Edge Gateway. If an IP address is allocated
to an Edge Gateway, but is not in use in any rule on that Edge Gateway, you
might decide to deallocate the IP address from that Edge Gateway so you can use
it in a different Edge Gateway.